The Partnership for Public Service honored the nine winners of this year’s Samuel J. Heyman Service to America Medals at a Washington, D.C. gala Thursday evening.

This video features Louis Milione of the Drug Enforcement Administration, winner of the Justice and Law Enforcement medal. Milione led a high-stakes federal undercover investigation spanning three continents that resulted in the arrest and conviction of the “Merchant of Death,” the world’s most notorious arms trafficker.

The medals, popularly known as “Sammies,” are awarded to public servants who are making high-impact contributions to the health, safety and well-being of Americans.

Read about and view videos of the other winners below: